Alloy-plated steel material having excellent corrosion resistance and high surface quality

Abstract

Provided is an alloy-plated steel material that can be used in home appliances, automobiles, and construction materials and the like and, more particularly, to an alloy-plated steel material having excellent corrosion resistance and high surface quality.

The invention claimed is: 
     
       1. An alloy plated steel material having excellent corrosion resistance and surface quality, comprising:
 a base iron, and a zinc alloy plated layer formed on at least one surface of the base iron, 
 wherein the zinc alloy plated layer comprises, by wt %, 0.5 to 2.0% of Mg, 0.5 to 2.5% of Al, and a balance of Zn and other inevitable impurities, and 
 a surface of the zinc alloy plated layer comprises a Zn single phase of a ratio of 15% or higher by an area fraction, and an average diameter of the Zn single phase is 30 μm or greater. 
 
     
     
       2. The alloy plated steel material of  claim 1 , wherein a surface roughness, Ra, of the zinc alloy plated steel material is 0.4 to 2.3 μm. 
     
     
       3. The alloy plated steel material of  claim 1 , wherein a surface gloss of the zinc alloy plated steel material is 40 to 120 at a surface measurement angle of 20° with reference to ISO 2813. 
     
     
       4. The alloy plated steel material of  claim 1 , wherein a plating delamination width of the zinc alloy plated steel material according to VDA 233-102 satisfies Relational Expression 1 below:
   Plating delamination width (mm)<−0.8×Mg content (wt %) in plating layer+3.  [Relational Expression 1]